Jump to content
  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

Recommended Posts

P0087 is not a good sign typically.  P0087 - Fuel Rail Pressure (FRP) Too Low.


Some "possible" indicators to causes that aren't the absolute worst:



Important: If the Change Fuel Filter Warning light is ON with DTC P0087, inspect the fuel filter for a restriction or contamination.


-A restricted, kinked, or damaged fuel supply line may cause DTC P0087 to set.

-If a low fuel condition is present and DTC P0087 sets, inspect the fuel sender pickup tube for damage or perforations.

-Water or gasoline contamination of the fuel may cause this DTC to intermittently set. Refer to Contaminants-in-Fuel Diagnosis.

-When ambient temperatures are below 0°C (32°F), the fuel tank pickup screen may be iced over from water in the fuel tank.

-When power enhancing devices have been attached to the fuel rail pressure sensor circuits, this DTC may set and adversely affect the fuel system components.

-If the fuel pressure relief valve is not torqued correctly, the valve will leak fuel into the fuel return system causing this DTC to set. -The fuel pressure relief valve uses a bite type seal, and proper torque is essential for valve to rail sealing. Refer to Fastener -Tightening Specifications.

-High fuel injector return flow may cause this DTC to set.

-The addition of fuel system enhancements, such as auxiliary fuel tanks or add on fuel filters may relate to driveability complaints.



What needs to be done however is a diesel fuel vacuum gauge needs to be installed at the injection pump to test if the injection pump is properly drawing fuel.  On 01-16 Duramaxes, the fuel injection pump pulls a vacuum on the fuel system.  There is no "lift pump" or low pressure side pump in the tank, unless an aftermarket one has been added (AirDog is a common brand or FASS).  


You should see 1–4 inches Hg vacuum when doing a gradual throttle sweep up to wide open.  Also, you need some sort of scanner or bi-directional scanner that can read fuel rail pressure.  

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.